Hello everyone,
I’m new here and already have a problem 🙂
Entrance area of the house, about 8sqm (86 sq ft).
Yesterday, I removed the old tiles (built around 1995). I expected screed under the tiles. It seems to be screed, but it contains quite coarse stones, up to about 8mm (0.3 inches) in size.
So, the tiles were laid quite poorly. By that, I mean the way the adhesive was applied. Cost-cutting was obvious everywhere in the house, including on the adhesive. In some areas, it was only applied in spots under the tiles, not fully covered.
In one area, about 1-2sqm (11-22 sq ft), the screed came up with the adhesive as well. I’d say it’s about 1 to 1.5cm (0.4 to 0.6 inches) deep there. It seems quite loose and crumbly in that section.
I have the new tiles and adhesive from a specialist store, not a general DIY store. The adhesive is from Sopro.
A professional told me that after removing the old adhesive, I should apply a thin, even layer of new adhesive over the screed to create a good bonding layer and a smooth surface for laying the tiles.
That part is clear. But: I can’t fill the deep spots with just adhesive, can I?
What should I do to avoid mistakes in the subfloor preparation? And how far or how deep should I remove the screed? Should I scrape off all loose parts with a spatula? Or only what the vacuum cleaner can pick up? Should I pre-treat the surface before filling (with a primer or bonding agent)?
I’d really appreciate any advice!
I’ve laid tiles several times before and it always turned out well, but on better-quality subfloors so far 😕
I’m new here and already have a problem 🙂
Entrance area of the house, about 8sqm (86 sq ft).
Yesterday, I removed the old tiles (built around 1995). I expected screed under the tiles. It seems to be screed, but it contains quite coarse stones, up to about 8mm (0.3 inches) in size.
So, the tiles were laid quite poorly. By that, I mean the way the adhesive was applied. Cost-cutting was obvious everywhere in the house, including on the adhesive. In some areas, it was only applied in spots under the tiles, not fully covered.
In one area, about 1-2sqm (11-22 sq ft), the screed came up with the adhesive as well. I’d say it’s about 1 to 1.5cm (0.4 to 0.6 inches) deep there. It seems quite loose and crumbly in that section.
I have the new tiles and adhesive from a specialist store, not a general DIY store. The adhesive is from Sopro.
A professional told me that after removing the old adhesive, I should apply a thin, even layer of new adhesive over the screed to create a good bonding layer and a smooth surface for laying the tiles.
That part is clear. But: I can’t fill the deep spots with just adhesive, can I?
What should I do to avoid mistakes in the subfloor preparation? And how far or how deep should I remove the screed? Should I scrape off all loose parts with a spatula? Or only what the vacuum cleaner can pick up? Should I pre-treat the surface before filling (with a primer or bonding agent)?
I’d really appreciate any advice!
I’ve laid tiles several times before and it always turned out well, but on better-quality subfloors so far 😕
S
Stefanlein6 Jun 2012 20:02Hello!
I would scrape out everything that is loose and crumbly, then sweep and vacuum the entire area.
I have always filled individual holes and depressions with tile adhesive the day before installation.
However, if you have more of a "crater landscape," a self-leveling compound might be the better choice.
To what extent tile adhesive is suitable for deeper holes, you can check the technical data sheet. According to the manufacturer, Sopro’s Flex adhesive S1 is definitely suitable for smoothing and filling up to 20mm (0.8 inches).
I would scrape out everything that is loose and crumbly, then sweep and vacuum the entire area.
I have always filled individual holes and depressions with tile adhesive the day before installation.
However, if you have more of a "crater landscape," a self-leveling compound might be the better choice.
To what extent tile adhesive is suitable for deeper holes, you can check the technical data sheet. According to the manufacturer, Sopro’s Flex adhesive S1 is definitely suitable for smoothing and filling up to 20mm (0.8 inches).
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